Answer
${^{35}_{17}Cl}$ . This is the nuclide symbol for the element chlorine, Cl that consist of 17 protons and 18 neutrons in the nucleus.
Work Step by Step
The element that has 17 protons in its nucleus is chlorine Cl . We find this in periodic table of the elements, as atomic number (Z) is given in this table. ( Z is the number of protons).
Mass number is the total number of protons and neutrons. In this case it is 35 ( 17 + 18).
So the nuclide symbol for the nucleus that contains 17 protons and 18 neutrons, should be ${^{35}_{17}Cl}$ .
